将文件的内容从特定行粘贴到另一个文件

我做了一个你可以使用的函数。

void CopyContentOfTextFile(char* sourceFile,char* targetFile,int targetLinE)
{

    FILE* resultFilePtr = fopen("result.txt","w");

    FILE* sourceFilePtr = fopen(sourceFile,"r");
    FILE* targetFilePtr = fopen(targetFile,"r");


    char line[256];
    int lineCounter= 0;

    while (fgets(line,256,targetFilePtr)!=NULL)
    {
        if (lineCounter == targetLine-1) 
        {
            char lineToBeAdded[256];
            //Now read sourceFile
            while (fgets(lineToBeAdded,sourceFilePtr) != NULL)
            {
                fprintf(resultFilePtr,"%s",lineToBeAdded);
            }
            fprintf(resultFilePtr,"\n");
        }
        fprintf(resultFilePtr,linE);
        lineCounter++;
    }

    fclose(sourceFilePtr);
    fclose(targetFilePtr);
    fclose(resultFilePtr);

    //Remove old movie.txt file with new one
    remove(targetFilE);
    rename("result.txt",targetFilE);

}

要调用它，请使用以下内容：

int main()
{
    char pathTosourceFile[] = "description.txt";
    char path@R_372_10586@rgetFile[] = "movie.txt";
    int line = 3;
    CopyContentOfTextFile(pathTosourceFile,path@R_372_10586@rgetFile,linE);
}